Humidifier



FIG. 1 is a top right front perspective view of the humidifier;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a top view thereof shown at a larger scale.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a humidifier, as shown and described. 